gdb/mips-fbsd-nat.c

   1 /* Native-dependent code for FreeBSD/mips.
   2
   3    Copyright (C) 2017 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #include "inferior.h"
  22 #include "regcache.h"
  23 #include "target.h"
  24
  25 #include <sys/types.h>
  26 #include <sys/ptrace.h>
  27 #include <machine/reg.h>
  28
  29 #include "fbsd-nat.h"
  30 #include "mips-tdep.h"
  31 #include "mips-fbsd-tdep.h"
  32 #include "inf-ptrace.h"
  33
  34 /* Determine if PT_GETREGS fetches REGNUM.  */
  35
  36 static bool
  37 getregs_supplies (struct gdbarch *gdbarch, int regnum)
  38 {
  39   return (regnum >= MIPS_ZERO_REGNUM
  40           && regnum <= mips_regnum (gdbarch)->pc);
  41 }
  42
  43 /* Determine if PT_GETFPREGS fetches REGNUM.  */
  44
  45 static bool
  46 getfpregs_supplies (struct gdbarch *gdbarch, int regnum)
  47 {
  48   return (regnum >= mips_regnum (gdbarch)->fp0
  49           && regnum <= mips_regnum (gdbarch)->fp_implementation_revision);
  50 }
  51
  52 /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
  53    for all registers.  */
  54
  55 static void
  56 mips_fbsd_fetch_inferior_registers (struct target_ops *ops,
  57                                     struct regcache *regcache, int regnum)
  58 {
  59   pid_t pid = get_ptrace_pid (regcache_get_ptid (regcache));
  60
  61   struct gdbarch *gdbarch = get_regcache_arch (regcache);
  62   if (regnum == -1 || getregs_supplies (gdbarch, regnum))
  63     {
  64       struct reg regs;
  65
  66       if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  67         perror_with_name (_("Couldn't get registers"));
  68
  69       mips_fbsd_supply_gregs (regcache, regnum, &regs, sizeof (register_t));
  70     }
  71
  72   if (regnum == -1 || getfpregs_supplies (gdbarch, regnum))
  73     {
  74       struct fpreg fpregs;
  75
  76       if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
  77         perror_with_name (_("Couldn't get floating point status"));
  78
  79       mips_fbsd_supply_fpregs (regcache, regnum, &fpregs,
  80                                sizeof (f_register_t));
  81     }
  82 }
  83
  84 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
  85    this for all registers.  */
  86
  87 static void
  88 mips_fbsd_store_inferior_registers (struct target_ops *ops,
  89                                     struct regcache *regcache, int regnum)
  90 {
  91   pid_t pid = get_ptrace_pid (regcache_get_ptid (regcache));
  92
  93   struct gdbarch *gdbarch = get_regcache_arch (regcache);
  94   if (regnum == -1 || getregs_supplies (gdbarch, regnum))
  95     {
  96       struct reg regs;
  97
  98       if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  99         perror_with_name (_("Couldn't get registers"));
 100
 101       mips_fbsd_collect_gregs (regcache, regnum, (char *) &regs,
 102                                sizeof (register_t));
 103
 104       if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 105         perror_with_name (_("Couldn't write registers"));
 106     }
 107
 108   if (regnum == -1 || getfpregs_supplies (gdbarch, regnum))
 109     {
 110       struct fpreg fpregs;
 111
 112       if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 113         perror_with_name (_("Couldn't get floating point status"));
 114
 115       mips_fbsd_collect_fpregs (regcache, regnum, (char *) &fpregs,
 116                                 sizeof (f_register_t));
 117
 118       if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 119         perror_with_name (_("Couldn't write floating point status"));
 120     }
 121 }
 122 \f
 123
 124 /* Provide a prototype to silence -Wmissing-prototypes.  */
 125 void _initialize_mips_fbsd_nat (void);
 126
 127 void
 128 _initialize_mips_fbsd_nat (void)
 129 {
 130   struct target_ops *t;
 131
 132   t = inf_ptrace_target ();
 133   t->to_fetch_registers = mips_fbsd_fetch_inferior_registers;
 134   t->to_store_registers = mips_fbsd_store_inferior_registers;
 135   fbsd_nat_add_target (t);
 136 }